Half to waltee eobeet johnston



(No Model.)

W. A. LEIPNER.

ARMATURE FOR DYNAMO ELECTRIC MACHINES.

No. 360,030. atented Mar. 29, 1887.

Fi q-l.

r T I E l i t L EH F WITNESSESZ INVENTU R1 UN TED STATES PATENT OFFICE.

\VILLIAM ADOLPH LEIPNER, OF LYNN, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO WALTER ROBERT JOHNSTON, OF SHERBROOKE, CANADA.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

EFFECIFICATION forming part of Letters Patent No. 360,030, dated March 29, 1887.

Application filed February 2-1, 1386 Renewed February 28, 1887. Serial No. 220,222.

To all whom it may concern.-

Be itknown that I ,WILLIAM ADOLPH LErr- NER, of Lynn, in the county of Essex and State of Massachusetts, have invented certain new 5 and useful Improvements in Armatures for Dynamo-Electric Generators and Motors, of which the following is a specification.

My invention relates to dynamo-electric generators and motors, and has for its object the improvement of armatures in such contrivances, whereby their construction is simplified and cheapened, and they are rendered more efficient and less liable to become heated.

To the foregoing ends my invention consists in the improvement in the armature of the Pacinotti type hereinafter described, and subsequently pointed out in the claims.

1n the drawings hereto annexed and forming a part of this specification, Figure 1 is a plan view of my improved armature, the four quarter-sections showing different views, as hereinafter explained. Fig.2 represents a section of the complete armature, taken on the line :0 0c of Fig. 1.- Fig. 3 represents an edge View of the armature. Fig. 4 represents a modification.

The same letters of reference refer to the same parts in all of the figures. A represents a disk or frame, preferably of wood, papier-mach, vulcanized fiber, or other strong material that is not a conductor of electricity. This frame in the present instance consists oftwo disks or circular plates, a a", provided with a hole in the center thereof for the reception of the shaft or axle of the armature, and having wedgeshaped recesses a in their adjacent surfaces, extending from their edges inwardly for a short distance, and wider at their inner than their outer ends,to receive the innerends of wedge-shaped division-pieces B, consisting of solid pieces ofcast or wrought iron, or pieces built up of a number of plates of sheet-iron and bolted together, as represented at b in Fig. 2.

As shown, the inner ends of division-pieces B fit snugly in recesses a of the plates a a, and from the edge of said plates to their outer ends they expand in width, as shown. These pieces are secured to the frame at regular intervals therearound, so as to form spaces of from each (No model.)

uniform size between them, as represented at- O in section 1 of Fig. 1. These spaces are formed slightly wider at their inner than their outer ends, for a purpose which will presently appear.

Bobbins D, having an iron core, d, and their side disks, d composed of any suitable insulating material, are made to fit snugly in the spaces 0, as shown in section 4 of Fig.1. These bobbins are wound with copper wire d and slipped ed gewise into said spaces, and are held from being thrown out or accidentally dislodged in the same way by plates (1*, secured by one of their ends to plates to a, and having the other end extending up and over the bob bin, as shown in section 2 of Fig. l and in cross-section in Fig. 2. The material composing the disks (1 of the bobbins ismade wedgeshaped in form in cross-section, so as to fit the wedge-shaped form of spaces 0, and by this 0 construction the bobbins are held from being thrown out of said spaces by centrifugal force in the revolution of the armature.

Plates or disks to a, after the parts described have been placed in proper position, are firmly bolted together by bolts E passing therethrough and through clamping-plates e e, as shown in Fig. 2.

Instead of constructing the disk or frame A of wood or material that is a non-conductor of electricity, it may be made of iron or any other suitable material, as rep resented in Fig. 4, and the division-pieces B insulated therefrom by lining the slots (6 with a lining, a", of vulcanized rubber or other suitableinsulating material.

By constructing the disks of the bobbins of insulating material and insulating the various parts of metal that are conductors of electricity other, I am enabled to construct the g0 armature as a complete ring, though not a continuous electric conductor-that is, while the armature is constructed as a complete ring of metal, a current of electricity cannot flow round it. Thus liability of a wasteful and heating 5 Foucault current being set up in the armature is avoided.

Having described my invention, what I claim 1. The combination, with the plate or frame provided with wedge-shaped radial recesses, the larger part of said recesses extending toward the center of the frame, of division-pieces having their inner ends constructed to fit.

snugly in said recesses and their outer portions from the edge of the frame to their outer ends of gradually and regularly expanded width, whereby the spaces formed between said pieces beyond the edge of the frame are made wider at said edge than at the ends of said pieces, and wire-wonnd bobbins constructed to fit snugly in said recesses, as set forth.

2. The combination, with the circular frame composed ofinsulating material, ofthe radiating spacing-pieces secured thereto at regular intervals therearound, the construction and arrangement of said spacing-pieces being such as that the spaces therebetween will be wider at the edge of the frame than at the end of the pieces, and wire-wound bobbins having disks or sides composed of insulating material, constructed to fit snugly in said spaces, as set forth.

3. The combination, with the circular frame, of the spacingpieces insulated from each other and the wire-wound bobbins having iron cores and sides or disks composed of insulating ma terial, said bobbins being arranged between the outer ends of said spacingpieces, as set forth.

4. The combination, with the circular frame A, of the spacing-pieces B, bobbins I), and plates (1", as set forth.

5. The combination, with the circular frame A, of the spacing-pieces B, insulated from each other, andthe wire-wound bobbins D, insulated from each other and from the spacing-pieces, as set forth.

In testimony whereofl have signed myname to this specification, in the presence oftwo subscribing witnesses, this lSth day of January, 1886.

XVILLIAM ADOL'PII LEIPNER.

YVitnesses:

G. F. BROWN, .ARLHUR W. Oizossmay. 

